Microphone.



H. R. STUART.

MICROPHONE.

APPLIUATION FILED MAB.. 21, 1908'.

Patented June 22, 1,909.

www-ceo HARVE R. STUART, OF WHEELING, WESTBVIRGLNIA.

MICROPHONE.

NQ. seneca.,l

Specii-catim1-v 0f Letters. Entente'. Appiieation med Maren 21, 199s.semi 1ra-422,396.:l

Patented use 32,.:.1999Qe To all rwhom t may concern:

Be it known that I, HARVE R. STUART, a citizen. of the AUnited States,residing Aat Wheeling,in the county of Ohio and State of We'st Virginia,have invented certain new and useful Improvements in Microphones, ofwhich the; following is a full, clear, and exact description.

My'invention relates to telephonie relays to be used for receiving andtransmitting voice currents, such as are presentin circuitsoftelegraphones, telephones, etc., and

comprises a microphone and a pair of magnets, the armatures of which areconnected respectively to the two electrodes ofpthe microphone so as tomove the same simul" is a side elevation of a 'relayvconf Astljllited.in accordance with my invention. Fig. 2 is a section on line2-2 of Fig.-1. 'Figg is a perspective view showing the arrangement; of the magneticparts of the re- 1ay,;the .supporting frame or body being removed forthe. sake of clear-ness.

'The .relay shown comprises a wooden base acarryinga frame or body 1 ofnommagnet c material,such as. aluminum, to which thezpmagnetic partsare. secured, and said arts as shown com rise four bar ma n ets P i a.2, 3, .4 and- 5, extending longitudinally with vres ect to the body,and in parallelism to eac ',other. The magnets 2 and 5 are secured.at.their respective ends byclamping screws 8 to .a ypair. .o U-shapedmembers 6 and 7 ofanagnetic material, which are in turn, securedtoQzthe, body. 1 by the screws 9. Threaded-.Wthinthe upper ends of .thearms opposing screws 11 and 11 Aoi.` magnetic 1,1184. terial, which formthe poleh ieees-l of, .the magnets 2 and, said screws.l eing he ],d inany desired. position oiadjustmentbsmlsjscrews. 12 threaded `in the.ends.-A of thefarmsp 10, Seid. arms being ,formedwth S1Qte..13i

which enable the arm to .bind .npon .--the screws v11 and 11.

Themagnets' 3 and. 4 lare securedat t he.ir ends to the T-shaped.members 14 and,. 15, each of which maybecomposedoftwo ing; vertedL-shaped partsas ShOLWn. Thehogri: zontalarms of the Amembers-14 and l5are secured to the body` 1 byscrews, not.shoyigi, $65l and vthe-magnets3 and'4 are, secured lo, clamping plateslG-held byscrews 17, vvl 1 ir.liii arethreadedin the members 14 and15. The. lower ends of. the-members14 l and i15.are t cut out as show'n in dotted lines in, -Fig', 3,forming lnotches within v which are sit u'a t e d the armatures 18 and19 respectively, 'Whiql'k armatures are inthe shape o elongatedgrods,thel ends of .which are respectively adjacentM the ends of the-,polepieceslljand11f,;`a11d 75 the centersof which are separated f romthemembers 14 and 15 by a short air ga Said armaturesare movableQin ailongit1'1'-ina1-di; rection, being supported at theirj centers,.insleeves 20 secured to or. rigidwith. vibratory.- .80 levers 21. Theselevers are of. thegforrn clearly shown, in. Figj2, havingcentralbendswhich are secured by screws 22 threaded within said. levers .to Het.torsion s 'rings-23, the ends `of .which are enlar ed tb.,.0rm.111gf5'which are secured tothe' bogyfl bythe 24. The inner extremities oftheleYlS 21 are secured respectivelyto the electrodes .25 and 26 of amicrophone, which ci any desired form, Such as thewelljkIlQWIl ...90'carbon-.dust microphone, one of said; elec trodes being electrically.connected to, its operating lever which is in, e1ectr1ca1 co n nectionwith, the frame; or body'.l, gandwthe, other 'electrode lis insulatedfrom its operat; 95- ing lever, and current is app,lied thereto througha .wire (not shown.)v connected in anysuitable manner. The electrodes 25and 26er@ supported .by thelrrespectlve levers 21, and .are vibratedthereby. Thejmagnets 109.

Y .3 and 4 are so .arrangedthalt .similar p01@ lpfesaid, Ueshapedmembers, are pairs of..4

arefapplied .te the. members. .14. and -15A for..

ofelectrodes movab e toward and away polarizgngthessme, rnd the l mam-dether 'of Vaiu Mode miV u 'the other.; Y5 are similarlyarranged for poa: Vthe armature, and coils for thevoice v arms 10and screws 11 and 11The screws currents andvarying the flux entering said 11 are of the samepolarity, and are of opposite polarity'to the pole piece 14.- The screwsv11 are of the samepolarity and of' oppositev polarity to the polepiecev 15. The

armatures 18 and 19 are therefore bythe attraction ofipclev pieces attheir o f hke ty and'acting in o posite direc- ;tion's. ere are fourcoils and tc tbeends of ceive thelvoice currents andjmay beloonnectedeither in series,'multiple, or series multlle, and they arevso woundthat a. cur- Brent.l in one simultaneous'l'y w r en the fluxpassing-through one strengthen* the ux pA through cause thefarmature'to' move towardA the e 26. At the same time, the coils vwhich surroundthe me pieces 11 will weaken'the tlux p ugh one of said i:gole piecesstrengten thellux passing. ough the :the the o rating lever 21 on itspivot, and 'moving e electrode26 away from the electrode 25. When'thecurrent 1s;

reversed, the various o erations will bereversed and the-elect es 25 and26 will be moved toward each other, whereby the twoelectrodes arevibrated in accordance wit Vthe waves of the voice currents.

Having now described my invention, what Iclaim, 1s: v

1. In 'a relay, the combination of ja microphone having a'. pair-ofelectrodes movable toward and away from each other, a pair of' armaturesmountedindependently of each other, ivotal arms connected respectivelyto said e ectrodes and armatures, one or more magnets adjacent saidarmatures, and means.

for varying the iiux of the magnetic circuits and thereb moving thearmatures in suchv a manner at the microphone electrodeswill .besimultaneously moved in opposite direc tions.` f

2. In a relay, the.f .combina`ti n of two or more magnetic circuitscomprising separate armatures, a micro' hone comprising a air m eachother, a ivotal arm connected to one of said elect es and one of saidarmatures and another pivotal' arm connected to tlxe*thecplixbination-,ot

.mex'nbem and? theu 11' applied 12' I the pole pieces 11 and 11',s'oastc surround the same,

the armatures 18A and vvcoils of the screws 11 and'pole pieceL14, andthe. other screw-lbandpole piece 14, so asto' lmore magnetic circuitscomp portions of sai 8. lIn a' evicerespoiiaxve to voice 2and 5,

U-shaped to of, a'nd -pole froml the arms ofisaxd '1 5. Ina deviceresponsivetovoice currents, the combinationl ofthe "Gta3 and 4', andT-shape'd members thereof. f

6. In a device res nsive'tovoicecurren the combination o the w Bf 4,and'pole pieces -thereto vand-liavfI ..e;-. en dsfor'receivingthe-armee:

h Puttarmatures, a microp one comprising .a of 'electrodes and a painoflevies; mounted lOn vtl'inltl pivots nd H nl lillil' 8. In a relay, thecombination ci twog more m netic circuits comprising ongalongitudignallyl movable armatures, v poles pieces adjustabletoward andaway 4from theends of said armatures, and pole c ppositepolarit1adjacent the inte able towar trodes to the lother armature.

armatures, and al phone com rising'a' pair of electrodes movs and'aw'ayfrom each other, 'one -of said electrodes being vconnected to one ofsaid armatures, and the other of 4said eleczrelay, the combinationof twoor' `ends with said amahues'and microphone electrodes.:

les

non-magneticframe, a plurality of.bar magenets applied. longitudinallyto `'the exteriorl thereo so as te inclosethe same and'pele- 'piecesextending to the interior of the frame I an armature and amicrophone-within sai frafne, and 'a connection between am ture and saidmicrophone for operating the latter.

10. In 'a rela the combination of a hollow non-magnetic ame, a'pluralityof bar magnets a plied longitudinally to the exterior thereolso astoinclose the same and a micro phone situated within said frame,andconnected with the armature of said magnet.

11. In a rela the combination o f a micrephone el' e, an armature, alever se;

cured its respective ends to vsaid armature and microphone electrode,and a torsion mature and of opposite polarity to said rst spring securedto the said lever intermedia-te po1e-piece and means for Varying themagits ends for supporting the same. net-ie ux of saidmagnetio circuit.

12. 1n a devlce responsive to voice curl In Witness whereof, I subscribemy signa- 5`1'entsf, the combination of one or more magture, in thepresence of two Witnesses. y nets orining a magnetic circuit and .comris- 'i ing one pole-piece formed with an opeiiing v HARVE R' STUARTnear the end thereof, a movable elongated Witnesses: armature extendingthrough 'said' opening FRANK S. OBER, 10 and pole-pieces adjacent theends of said ar- VVALDO M. CHAPIN.

